Initialise the library

Initialise the library within the <script> tag, or within a JavaScript file, of the payment page. This must be placed after all the payment components.

An example of initialising the library:

<script> 
     let pay360DC = new Pay360DC(config);
     pay360DC.initiatePayment();
</script> 

This initialisation requires a config object and makes a call to the initiatePayment function, which are described below.

Config object

The config object is required to:

• Provide parameters to the library

• Customise the look and feel of the Direct Checkout UI (optional)

• Handle the Direct Checkout response.

The attributes available in the config object are described below.

Mandatory attributes

An example of setting mandatory attributes in the config object:

<script>
  let config; 
  config = { 
  		isvId:  parseInt(isvId),
  		transactionId:  parseInt(transactionId), 
		sessionId:  sessionId,
		callbackResponse:  callbackResponse
  } 
</script>	  

Callback response

The callbackResponse attribute is a reference to a function that must be written to handle the response from Direct Checkout. Refer to Processing a payment with Direct Checkout - Handle payment processing response section.

function callbackResponse(status, type, response) 
{ 
  //  Handle payment processing response 
} 

Important: The callback response will not provide the final status of the transaction. Since the response is returned to the browser, the integrator must query for a final payment status by making a sever-to-server request.

Optional attributes

An example of setting optional attributes in the config object:

<script>
  let config; 
  config = { 
  		isvId:  parseInt(isvId),
  		transactionId:  parseInt(transactionId), 
		sessionId:  sessionId,
		callbackResponse:  callbackResponse
        styles:  { 
  	    //  See Styling 
        }, 
        localisations:  { 
  	    //  See Localisation 
        }, 
        defaultFocus: pay360-cardholder-data,
        applePayCaptureBillingAddress: "false",
        inputLabelInsideBorder: "false",
        card: {
        layoutType: "default"
        },
        labelPosition: "left-justified",
        googlePay: {
        buttonType: "pay",
        buttonLocale: "en"
  } 
</script>	

Apple Pay billing address

The "applepayCaptureBillingAddress" attribute enables the capture of a billing address via Apple Pay. This is a conditional attribute based on your requirements.

• If your integration is not supplying billing details in the payment intent, and “applepayCaptureBillingAddress” is set to true, a billing address may be captured by Apple Pay.

• If your integration is not supplying billing details in the payment intent, and “applepayCaptureBillingAddress” is set to false, no billing address will be captured.

• If your integration is supplying billing details in the payment intent, and “applepayCaptureBillingAddress” is set to true, any billing address captured by Apple Pay will overwrite the data from the payment intent.

• If your integration is supplying billing details in the payment intentand “applepayCaptureBillingAddress” is set to false, the billing address from the payment intent will be used.

We will require a billing email to provide an Access PaySuite email receipt, which may only be sent in the payment intent.

Initiate Payment function

When the payer is ready to choose their payment method, the initiatePayment function on the pay360DC object should be made. This will verify that the configuration provided is valid.

The response to this method will trigger a callback event for the optional function provided for “config.initiatePaymentCallbackResponse” (refer to Optional Attributes section below). The function will contain a parameter with a list of the allowed payment methods. The integrator can use this function to perform specific handling. Possible use cases are:

• Present a message showing a list of payment methods which are accepted.

• Hide text labels, messages and styling related to payment methods which are not accepted.

Initiate Payment Callback Response

InitiatePaymentCallbackResponse is a reference to a function that must be written to handle the response from Direct Checkout when initialized using the initiatePayment function.

This callback function has single parameter of “allowedMethods” which is of type string array. This will contain an array of allowed payment methods. The possible values of the array items are CARD, APPLE_PAY, GOOGLE_PAY, and PAY_BY_BANK_ACCOUNT.

The ISV can modify their DOM based on the allowed payment methods to facilitate their end user with only allowed payment methods.

Note: Direct Checkout handles the visibility of the components. Only elements of the integrator payment page need to be handled by this function.

An example of implementing the callback function:

initiatePaymentCallback(allowedMethods: string[]) 
{
// Integrator can modify their DOM based on the values of the allowedMethods.
}